After two splits in under a year, Katy Perry thinks the third time with John Mayer will be the charm. To help hedge her bets a little, though, she's established some ground rules that we're sure he'll follow for a week or so.

Now that Katy Perry and John Mayer are back on again, the 'Fireworks' songstress is laying down some ground rules for the 'Paper Doll' singer-songwriter. If he wants to date Perry again, he's got to follow some dang guidelines!

John Mayer has a new song out called 'Paper Doll' that may be a response to Taylor Swift's break-up song about him called 'Dear John.' And while John doing a song about Taylor who did a song about him is all very meta, even more confusing is the fact that Mayer teamed up with Prancercise creator Joanna Rohrback to demonstrate how to properly "romancercise" to the new song.

Memorial Day Weekend has come and gone and along with it many backyard barbecues with friends and family. Katy Perry also had a Memorial Day BBQ and who was in attendance? Well, none other than her ex-boyfriend John Mayer!

Throat surgery seems to have gone very well for John Mayer. It gave him time to think about his life, prompting him to admit his wrongdoings to his many spurned ex-flames (even the ones who can't seem to get over him already).

And now he's expanded his humanitarian efforts to those who really need it -- by helping fix up some veterans' homes in Louisiana.

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